Buckle



FIG. 1 is a front view of a buckle of the claimed design;

FIG. 2 is a rear view of the buckle of FIG. 1.

FIG. 3 is a plan view of the buckle of FIG. 1.

FIG. 4 is a base view of the buckle of FIG. 1.

FIG. 5 is a right side view of the buckle of FIG. 1, the left side view being symmetrical to the right side view; and,

FIG. 6 is a perspective view of the buckle of FIG. 1. 

The ornamental design for a buckle, as shown and described. 